SYNTHESES AND STRUCTURES OF [MCL(NN)(DPT) ](2+) (M=CO, RH NN=BPY, PHEN) COMPLEXES

The cobalt(III) and rhodium(III) complexes containing a terdentate lig and (bis(3-aminopropyl) amine, abbreviated as dpt) which forms two six -membered chelate rings, and a bidentate ligand (2,2'bipyridine or l,l 0-phenanthroline, abbreviated as bpy or phen, respectively) forms a pl ane five-membered chelate ring, CoCl(bpy) (dpt)](2+), CoCl(phen) (dpt) ](2+), [RhCl(bpy)(dpt)](2+), and [RhCl(phen) (dpt)](2+), were prepared . The crystal structures of the perchlorate salts were determined by X -ray diffraction method as mer-endo(Cl, NH)-isomer (Fig. 1(a)) for two cobalt(III) complexes, and as mer-exo (Cl, NH)-isomer (Fig. 1(a)) for two rhodium(III) ones. All the six-membered chelate rings formed by d pt ligand adopted chair conformation. The analogous cobalt(III) comple xes containing a terdentate rigand (N-(2-aminoethyl)-1,3-propanediamin e, abbreviated as aepn) which forms a five- and a six-membered chelate rings, [CoCl(bpy) (aepn)](2+) and [CoCl(phen) (aepn)](2+), were also prepared. The structures of the complexes were identified on the basis of the spectroscopic data as the mer-type. For all the complexes prep ared in this work, no fac-isomers were obtained or detected.